Quasinormal modes and absorption of a massless scalar field for the magnetic Gauss-Bonnet black hole  

作　　者：Chen Ma Yu Zhang Qian Li Zhi-Wen Lin 

机构地区：[1]Faculty of Science,Kunming University of Science and Technology,Kunming,Yunnan 650500,China

出　　处：《Communications in Theoretical Physics》2022年第6期113-121,共9页理论物理通讯（英文版）

基　　金：supported partly by the National Natural Science Foundation of China (Grant No. 12065012);Yunnan High-level Talent Training Support Plan Young & Elite Talents Project (Grant No. YNWR-QNBJ-2018-360);the Fund for Reserve Talents of Young and Middle-aged Academic and Technical Leaders of Yunnan Province (Grant No. 2018HB006)。

摘　　要：We study the massless scalar quasinormal frequencies of an asymptotically flat static and spherically symmetric black hole with a nonzero magnetic charge in four-dimensional extended scalar-tensor-Gauss-Bonnet theory. The results show that the real part of the quasinormal frequency becomes larger and the imaginary part becomes smaller with increasing the magnetic charge or the angular harmonic index. The existence of magnetic charges will reduce the damping of scalar perturbation, but increase the frequency. We also study the absorption crosssection of the scalar field in this black hole. We find that its curve will become lower as the magnetic charge increases, i.e. the magnetic charge will weaken the absorption capacity of the black hole. Meanwhile, the high-frequency limit of the total absorption cross-section is just the area of black hole shadow.

关 键 词：quasinormal modes SCATTERING absorption cross-section massless scalar field magnetic Gauss-Bonnet black hole 

分 类 号：P145.8[天文地球—天体物理]